Protective faceshield

ABSTRACT

A protective faceshield is provided with head gear in which the head band may be positively adjusted to the proper size by an operator grasping and squeezing the head band with the fingers of one hand. One head band member is provided with a plurality of cam members which cooperate with the holes to provide a unidirectional slip adjustment in one direction and a positive locking in the opposite direction. The head band includes at the ends thereof apertured bosses for receiving corresponding studs of the head gear in a tight press fit to permit the head band to be popped from the head gear to facilitate ready replacement in the field. The head gear is pivotally attached to the crown, which pivotal attachment includes apparatus for providing a plurality of stop locations of the crown relative the head gear and which includes an overriding bevel or cam pin to permit the adjusting elements to slide past the stop in one direction and be positively stopped in the other direction to prevent excessive downward movement of the window. The window is releasably secured to the crown by a locking strap having a plurality of spaced-apart protrusions which cooperably engage corresponding spaced-apart apertures in both the window and the crown. The locking strap is semi-detachable from the crown to permit ease in replacement and proper tensioning of the window and to prevent loss of the strap.

United States Patent Amundsen et al.

[54] PROTECTIVE FACESHIELD [72] Inventors: Paul D. Amundsen, WonderLake; John N. Liautaud, Glenview, both of 111.

[73] Assignee: Fendall Company, Chicago, Ill.

[22] Filed: Nov. 3, 1969 [21] Appl. No.: 873,242

[52] US. Cl. ..2/8, 24/16 PB [51] Int. Cl. ..A42b 1/00, A42b H22 [58]Field of Search ..2/10, 5, 6, 3, 9, 8; 24/20 TI,

3 24/24 R, 16 PB,213R,216R

Primary Examiner-H. Hampton Hunter Attorneyl-lill, Sherman, Meroni,Gross & Simpson 00 I .49 00 if 14 00 OOOOOO 1 Oct. 10,1972

[ ABSTRACT A protective faceshield is provided with head gear in whichthe head band may be positively adjusted to the proper size by anoperator grasping and squeezing the head band with the fingers of onehand. One head band member is provided with a plurality of cam memberswhich cooperate with the holes to provide a unidirectional slipadjustment in one direction and a positive locking in the oppositedirection. The head band includes at the ends thereof apertured bossesfor receiving corresponding studs of the head gear in a tight press fitto permit the head band to be popped from the head gear to facilitateready replacement in the field. The head gear is pivotally attached tothe crown, which pivotal attachment includes apparatus for providing aplurality of stop locations of the crown relative the head gear andwhich includes an overriding bevel or cam pin to permit the adjustingelements to slide past the stop in one direction and be positivelystopped in the other direction to prevent excessive downward movement ofthe window.

The window is releasably secured to the crown by a locking strap havinga plurality of spaced-apart protrusions which cooperably engagecorresponding spacedapart apertures in both the window and the crown.The locking strap is semi-detachable from the crown to permit ease inreplacement and proper tensioning of the window and to prevent loss ofthe strap.

11 Claims, 13 Drawing Figures P'ATENTEDucI 10 m2 SHEET 2 BF 3PATENTEDucr 10 m2 SHEET 3 BF 3 INVENTORS Pal ZZZ flizzzzzza'ifiezzPROTECTIVE FACESHIELD BACKGROUND OF THE INVENTION 1 Field of theInvention This invention relates to protective faceshield apparatus andmore particularly to protective faceshield apparatus which is adaptedfor easy replacement of its component parts and in which the adjustmentof the head gear and the window relative the head gear to the heeds ofthe individual wearer is provided by easily operable positive lockingapparatus.

2. Description of the Prior Art Heretofore, some protective faceshieldapparatus have utilized a hole and stud arrangement for varying the headband size. Such arrangements, however, are not readily adjustable andhead bands incorporating such arrangements must be pre-set to a givenhead size. This type of construction usually involves several trial anderror adjustments before an acceptable head band setting is achieved. Aratchet adjustment is quite commonly used on larger faceshield headgears. This ratchet adjustment, while permitting ready adjustment byrotation of the ratchet to obtain a comfortable fit, does not provide apositive adjustment in that excessive pressure will cause the ratchetarrangement to skip or jump to a different setting, thus inadvertentlypermitting the change in the head gear size.

Various constructions have been provided to control the positioning ofthe faceshield crown and window relative to the faceshield head gear.Generally, the prior arrangements have been relatively fixed and preventonly limited movement within a limited framework as defined by thenumber of stops involved and the spacing therebetween. The positioningof the faceshield crown and window has therefore been limited in boththe direction of travel and the extent of travel. The windows of priordevices have been attached to the crown by the use of snap fastenerswherein the crown element is directly snapped into the window element.Another type of fastening for the window utilizes a window locking strapin which the strap is affixed to the crown leaving a space sufficientfor the window to be located between the strap of the crown. Theseconstructions, while providing positive locking engagement between thecrown and the window, have attendant disadvantages including poor fitand poor alignment of components upon changes in ambient conditions.

Various leaf, washer and coil spring arrangements have been utilized inprior constructions in conjunction with a nut, a bolt or threadedfastener to provide a tension adjustment between the crown and the headgear. However, all of the aforementioned tensioning arrangements aresubject to wear in that metallic elements subject the crown and the headgear component parts to constant abrasion, requiring constantadjustment, if available, to maintain the proper tension.

SUMMARY OF THE INVENTION According to the invention, protectivefaceshield apparatus is provided with an adjustable top head band andrear head band. The top head band includes two cooperable portions, onehaving a snap fastener an the other having a plurality of spaced apartopenings for receiving the snap fasteners. The rear head band isprovided with a unidirectional adjustment feature with a locking featurein the opposite direction. The rear head band includes twointerengageable portions one of which includes a plurality ofspaced-apart holes and the other of which includes a pair of cam pins tobe received by the holes. The cam pins each include an overriding bevelsurface which causes the pins to override the edges of the holes as thehead band is tightened and to lock into the holes upon termination ofthe adjusting pressure which is provided by the fingers of one handgrasping and squeezing the rear head band elements together.

Each end of the rear head band is provided with an apertured boss thatis press-fit upon a corresponding stud on respective sides of the tophead gear. The press fit securement of these parts may be readilysnapped apart for replacement of the rear head band in assembly in thefield.

The head gear is pivotally attached to the faceshield crown and isprovided with a stop adjustment which features a unidirectional stopelement in he form of an overriding bevel or cam pin which permits theadjusting elements to slide past the stop in one direction and be fixedand positively stopped in the other direction. This feature isadvantageous over the prior devices in that the faceshield head gear canbe rotated within the framework of the faceshield crown in a givendirection and will yet provide a positive stop in the oppositedirection.

The faceshield window is releasably attached to the faceshield crown bya positive locking arrangement including a locking strap that ispivotally fixed to one side of the crown and releasably locked to theother side of the crown. The locking strap includes a plurality ofspaced-apart studs which extend through a corresponding plurality ofspaced-apart slots in both the crown and the faceshield window. Withthis arrangement the faceshield window and the faceshield crown arepositively attached and properly tensioned and the window is fixed tothe crown without any excessive movement therebetween. This arrangementtherefore provides a positive means of locating the window relative tothe crown and prevents the window locking strap from being inadvertentlylost since it remains pivotally attached to one side of the faceshieldcrown.

Further, the head gear, the crown, and the stop adjustment are securedtogether by an adjustment means for providing proper tension adjustmentbetween the crown and the head gear. This adjustment is important inthat varying humidity and temperature conditions causes shrinkage andexpansion of the components of the faceshield apparatus. The head gearcomponents and the stop adjustment are therefore preferably fabricatedfrom plastic material and the apparatus for attaching the head gear andstop adjustment components to the faceshield crown includes a manuallyadjustable screw element which is operable to compensate for componentchanges effected by ambient conditrons.

It is therefore a primary object of the present invention to provideprotective faceshield apparatus in which the components may be easilyreplaced.

It is another object of the invention to provide protective faceshieldapparatus in which the size of the head gear is easily adjustable andincorporates positive locking apparatus to maintain proper head sizeupon adjustment.

It is yet another object of the present invention to provide improvedapparatus for defining the relative position of the faceshield crown andwindow to the head gear of the faceshield apparatus.

BRIEF DESCRIPTION OF THE DRAWINGS Other objects, features and advantagesof the invention, its organization, construction and operation will bereadily apparent from the following description of a preferredembodiment thereof, taken in conjunction with the accompanying drawings,although variations and modifications may be effected without departingfrom the spirit and scope of the novel concepts of the disclosure, andin which:

FIG. 1 is a rear elevational view of a protective faceshield constructedin accordance with the principles of the present invention;

FIG. 2 is a side-elevational view of the protective faceshield apparatusof FIG. 1;

FIG. 3 is a fragmentary view of the rear head band of the faceshieldapparatus of FIGS. 1 and 2, illustrated in cross-section;

FIG. 4 is a sectional view of the rear head band taken along the lineIVIV of FIG. 1;

FIG. 5 is a fragmentary elevational view of one end of a rear head bandshowing its attachment to the remainder of the head gear;

F IG. 5a is a cross-sectional view taken vertically toward the leftthrough the center of F IG. 5;

FIG. 6 is a fragmentary view of the top head band of the apparatusillustrated in FIG. 1, shown in cross-section;

FIG. 7 is a sectional elevational view of the left side of theprotective faceshield apparatus taken along the line VIIVII of FIG. 1;

FIG. 8 is a detailed illustration of the adjustable stop apparatusaccording to the present invention shown with certain parts broken away;

FIG. 9 is a sectional view of the adjustable stop apparatus of theinvention taken along the line IXIX of FIG. 7;

FIG. 10 is a fragmentary view illustrating the releasable securement ofthe window strap to one side of the faceshield crown, shown partially incross-section;

FIG. 11 is a fragmentary view illustrating the pivotal securement of theother end of the window strap to the opposite side of the faceshieldcrown, shown partially in cross-section; and

FIG. 12 is a sectional view taken along line XII-XII of FIG. 1illustrating the securement of the faceshield window to the faceshieldcrown by the faceshield strap.

DESCRIPTION OF THE PREFERRED EMBODIMENT A protective faceshield isgenerally shown at 10 as comprising a faceshield crown 11, a faceshieldwindow 12 depending from the crown 11, a head gear 13 which is pivotallysecured to rear depending sections 16 and 17 of ,crown 11 by tensionadjusting apparatus 14 and 15.

The rear head gear 13 comprises a perforated section 18 including pairsof aligned holes 19 and a slide 20 including integral plate portions 21and 22 spaced apart by edges 23 so as to slidably embrace a second rearhead band section 24. The section 24 comprises an end guide portion 25including an integral portion 26 spaced apart therefrom by edges 27 toslidably embrace head band section 18. The end section 25 carriesunidirectional cam sections 28 thereon for snapping over the edges ofholes 19 upon application of a closing pressure on the rear head band,urging end sections 20 and 25 away from each other. This may beaccomplished readily while the gear is positioned on the wearers head.Upon release of the forces effecting this adjustment, cam sections 28positively lock head band sections 18 and 24 against parting in thedirection of increasing head size until the gear is removed from thehead and the end portion 25 can be flexed away from section 18 and thecams 28 slipped past the apertures 19 to enlarge the adjustment.

The head gear 13 includes a front band 29 including a pair of rear ends30 each of which carry a stud 31. The head sections 18 and 24 each havean integral boss 32 arrangement at the ends thereof for releasableattachment to corresponding ends 30 of the front band 29. This apparatusis illustrated in FIGS. 5 and 9 with respect to head band sections 18and 24. The head band section 18 carries a boss 32 integral or fixedthereto including a central bore 35 for passing stud 31 with annularridge 34 in a snapped-over interference fit. The space between the ridge34 and band 30 may be slightly greater than the thickness of band 18 or24 including bosses 32 to provide free pivoting between the parts.Alternatively, a shorter stud provides a frictional pivot.

The top band of the faceshield is provided by a pair of sections 36 and37. Section 37 includes an end portion 40 having an integral portion 41with a plate 42 which wraps around to slidably embrace section 36. Thesection 37 further includes a plurality of spacedapart holes 39 forreceiving a snap fastener 38 which is integral with or separate from andsecured to section 36. The top head band strap may therefore be adjustedby selective positioning of snap fastener 38 to the proper hole 39.

The protective faceshield is provided with a variable stop adjustment 43for positioning the faceshield crown 11 and faceshield window 12relative to the head gear 13, as illustrated in detail in FIGS. 7, 8 and9. The faceshield crown 11 is provided with a camming pin 44 having acamming surface 45 disposed in the path of rotation of the stopadjustment 43 so that the stop adjustment rides over the pin whenrotated in one direction and abuts the pin when rotated in the oppositedirection. The crown 11 is provided with a counter-bored aperture 46 forreceiving a pressure transmitting means or bushing 47 in one diameterthereof and one shaped portion 59 of a rotatable means or steppedelement 52 which is integral with portion 53 of the head gear 13 in theother diameter thereof. The stepped portion 59 also extends through abore 48 of bushing 47 and includes a threaded bore 51 for receiving ascrew 49 having an adjustment knob 50. As can be seen in FIG. 7, bore 48and the extended portion 59 of stepped element 52 having a generallyrectangular shape to key the components together for mutual rotation soas to prevent inadvertent tightening or loosening of these element.

The stop adjustment 43 further comprises first and second adjustmentmembers 56 and 57 which are mounted about the extended portion of stepelement L first and second sections to permit relative movement thereofin one direction and selectively prevent relative movement thereof inthe opposite direction for adjusting to head size and means for securingsaid faceshield to said crown comprising a strap, non-yielding meansfixedly pivotally securing said strap at one end thereof to said crownand including a plurality of spaced-apart protrusions thereon, saidcrown and said window having corresponding spaced-apart and alignedapertures therein for receiving said protrusion, and adjustablerotatable cam means for releasably securing the other end of said strapto said crown to provide an interlocked crown and window assembly, saidsecuring cam means including means for positively tensioning said strapin assembled relation.

3. In a protective faceshield, a crown, a window secured to said crown,head gear, means adjusting said head gear to the head size of thewearer, and coupling means for pivotally securing said head gear to saidcrown, said coupling means comprising means forming an aperture in saidcrown, rotatable means carried by said head gear and including a shapedportion extending through said aperture having a threaded bore therein,and being axially longer than the aperture to project a distance fromthe crown, screw means for threadedly engaging said threaded bore, saidscrew means including a head, and a pressure transmitting memberincluding a shaped bore conforming to the shape of and receiving saidshaped portion of said rotatable means for mutual rotation therewith,said pressure transmitting member disposed between said head of saidscrew means and said crown and being axially thicker than said distancein order to be directly engaged by said head and to space said head andsaid crown to prevent loosening of said screw means upon rotationalmovement of said head gear relative said crown.

4. In a protective faceshield, a crown, a window secured to said crown,head gear, means adjusting said head gear to the head size of thewearer, and coupling means for pivotally securing said head gear to saidcrown, said coupling means comprising means forming an aperture in saidcrown, rotatable means carried by said head gear and including a shapedportion extending through said aperture having a threaded bore therein,screw means for threadedly engaging said threaded bore, said screw meansincluding a head, and pressure transmitting means including a shapedbore conforming to the shape of and receiving said shaped portion ofsaid rotatable means for mutual rotation therewith, said pressuretransmitting means disposed between said head of said screw means andsaid crown to space said head and said crown to prevent loosening ofsaid screw means upon rotational movement of said head gear relativesaid crown, including an arm secured for rotation with said head gear,and means on said crown cooperable with said arm to prevent rotation ofsaid arm relative to said crown in one direction and permit rotation ofsaid arm in the opposite direction.

5. In a protective faceshield, a crown, a window secured to said crown,head gear, means adjusting said head gear to the head size of thewearer, and coupling means for pivotally securing said head gear to saidcrown, said coupling means comprising means forming an aperture in saidcrown, rotatable means carried by said head gear and including a ashaped portion extending through said aperture having a threaded boretherein, screw means for threadedly engaging said threaded bore, saidscrew means including a head, and pressure transmittingmeans including ashaped bore conforming to the shape of and receiving said shaped portionof said rotatable means for mutual rotation therewith, said pressuretransmitting means disposed between said head of said screw means andsaid crown to space said head and said crown to prevent loosening ofsaid screw means upon rotation movement of said head gear relative saidcrown, including an arm secured for rotation with said head gear, andmeans cooperable with said arm to prevent rotationin one direction andpermit rotation in the opposite direction, wherein the last-mentionedmeans includes apin secured to said crown in an interferencerelationship with rotational travel of said arm, said pin having acamming surface oriented to permit override thereof by said arm uponrotation of said opposite direction.

6. In a protective faceshield having a crown, a window secured to saidcrown and head gear secured to said crown, the improvement comprisingmeans for releasably securing said window to said crown including firstmeans forming a plurality of spaced-apart apertures in said window,second means forming a plurality of spaced-apart apertures in said crownfor alignment with the apertures of said window, a strap, non-yieldingmeans fixedly pivotally securing said strap at one end thereof to saidcrown, said strap including a plurality of protrusions thereon to bereceived by the aligned apertures of said crown and window, andadjustable means for releasably securing the other end of said strap tosaid crown with said strap adjustably tensioned.

7. In a protective faceshield having a crown, a window secured to saidcrown and head gear secured to said crown, the improvement comprisingmeans for releasably securing said window to said crown including firstmeans forming a plurality of spaced-apart apertures in said window,second means forming a plurality of spaced-apart apertures in said crownfor alignment with the apertures of said window, a strap, meanspermanently pivotally securing one end thereof to said crown, said strapincluding a plurality of protrusions thereon to be received by thealigned apertures of said crown and window, and means for securing theother end of said strap to said crown with said strap in tension,wherein the last-mentioned means comprises lever means secured to saidcrown, means forming an elongate slot in said other end of said strapfor receiving said lever means, and means formed on said crowncooperable with said lever means to tension said strap, said lever meansbeing adjustable and releasably securing the strap in adjustabletension.

8. A crown-to-headgear attachment comprising means for pivotallysecuring said head gear to said crown including means forming a circularaperture in said crown, rotatable means carried by said head gearincluding a shaped portion extending through said aperture including athreaded bore, and being axially longer than said aperture,finger-operated screw means for threadably engaging said threaded boreand having a head, and pressure transmitting means including a non-roundshaped bore for receiving said shaped portion disposed between saidcrown and said screw means 52. Element 57 is freely rotatable aboutelement 52; however, element 56 includes a plurality of projections 55which are received by corresponding slots 54 of ele ment 52. Theseprojections and slots fix element 56 relative to the head gear 13.Element 57 includes teeth 58 thereon for engagement with the teeth 59 ofelement 56, said teeth being disengaged by movement of portion 60 towardthe crown 1 1. Therefore, element 56 is fixed relative to the front band29 and top head band 36,37, and element 57 is adjustable relative toelement 56; and the provision of the unidirectional camming pin 44permits mutual rotation of the front band 29 and the stop adjustment 43relative to the crown 11 in the direction of lifting the shield 12, andprevents rotation of these elements in the opposite direction beyond thepin 44.

It is preferred that plastic components be employed for the head gearand stop adjustment components to permit a positive adjustment of thefrictional tension between the front band 29 and the crown 11. Thisadjustment is important due to the varying conditions which areencountered in the field; for example, excessive humidity andtemperature conditions and variations thereof cause plastic componentsto shrink or expand according to the local conditions and the adjustmentof tension is a simple matter by turning knob 50. Of course, the otherside of the faceshield is provided with similar friction adjustingapparatus with the exception that the stop adjustment elements may beomitted. The foregoing construction is such that wear is considerablyreduced and a positive tensioning adjustment is permitted withoutaccidental loosening of the elements. In addition, an unlimitedadjustment in terms of the amount of tension can be accomplished withthe foregoing construction.

As previously mentioned, the faceshield is provided with a faceshieldwindow 12 which depends from the crown 1 1. Attention is invited toFIGS. 1, 10, 11 and 12 for a detailed description of this feature. Thefaceshield is provided with a window locking strap 61 which is pivotallysecured to the crown 11 at one end thereof by means of integral pin 62,which extends through aperture 64 of the crown l1 and is retained byoversized snap surface 6221. This is a positive, pivotal, attachmentwhich prevents loss of the strap when the remainder of the strap isdisengaged from the crown 11. The window 12 and the crown 11 areprovided with a plurality of aligned slots 12a and 11a, respectively,for receiving protrusions 61a of window strap 61. These slots arepreferably of greater length than the length of protrusion 61a toprovide a proper tensioning and the slots in the window 12 arepreferably of a width the same or slightly smaller than the width of theprotrusion to provide a snug, non-rattling connection with the window12. The other end of the strap 61 is provided with an elongate slot 65for receiving a pivotal lever arm 66 including a shaft portion 66a whichextends through slot 65 and aperture 67 of crown ll. Shaft portion 66ais provided with a flange portion 70 which bears against crown 1 l and abushing or washer 69 which is secured between crown 11 and a roundedhead portion 71.

Lever arm 66 is rotatable to be aligned with elongate slot 65 forreceiving a pivotable lever arm 66 including a shaft portion 66a whichextends through slot 65 and aperture 67 of crown 11. Lever arm 66 isrotatable to be aligned with elongate slot for disengagement of strap 61from crown ll, strap 61 remaining attached to the crown at its oppositeend. Shaft portion 66a cooperating with aperture 65 comprises aneccentric about the axis of aperture 67 to provide a tensioning of strap61 when lever 66 is in the latch position shown in FIG. 2.

Generally then there has been described a protective faceshield in whichthe component parts are easily adjusted and readily replaced in thefield. The faceshield includes a window locking strap which providesproper alignment and tensioning of the window and which is preventedfrom inadvertent loss by its semi-detachable configuration. Theprotective faceshield is further provided with a unidirectionalrotatable and variable stop adjustment which provides a greater degreeof freedom in selecting positions of the faceshield crown and windowrelative to the head gear. Further, the individual components of thehead gear and the stop adjustment mechanism are constructed andpivotally secured to the crown in such a manner as to considerablydecrease wear of the components while at the same time providing anunlimited tensioning adjustment between the crown and the head gear.

It will be clear that since many components of this head gear areplastic, parts shown as separate parts with a connector may be madeintegrally of plastic or vice versa within the concepts of thisinvention.

What we claim is:

1. A protective faceshield comprising: a crown, a faceshield windowsecured to said crown, head gear secured to said crown including firstand second head band sections, engagement means coupling said first andsecond sections to permit relative movement thereof in one direction andselectively prevent relative movement thereof in the opposite directionfor adjustment to head size, and means for pivotally securing said headgear to said crown including means forming an aperture in said crown,rotatable means carried by said head gear including a shaped portionextending through said aperture including a threaded bore,finger-operated screw means for threadably engaging said threaded bore,pressure transmitting means including a non-round shaped bore forreceiving said shaped portion disposed between said crown and said screwmeans for mutual rotation with said rotatable means to permit rotationof said head gear without loosening said screw means, and a firstadjustment member disposed between said crown and said rotatable meansincluding at least one projection thereon, said rotatable meansincluding means for receiving said projection to fix said rotatablemeans and said first adjustment member for mutual rotation, and a secondadjustment member mounted for rotation with said first adjustmentmember, means for adjusting the position of said members relative toeach other, and cam means secured to said crown and disposed to abutsaid member upon rotation of said head gear in one direction, said cammeans including a cam surface permitting a spring override of said cammeans by said member upon rotation of said head gear in the oppositedirection.

2. A protective faceshield comprising: a crown, a faceshield windowsecured to said crown, head gear secured to said crown including firstand second head band sections, and engagement means coupling said formutual rotation with said rotatable means to permit rotation of saidhead gear without loosening said screw means, said pressure transmittingmeans being axially longer than the part of said shaped portionprojecting beyond the aperture for direct engagement between said headand said pressure transmitting means.

9. Attachment structure for securing a curved window to a curved crowncomprising a strap, non-yielding means fixedly securing said strap atone end thereof to said crown, said strap including a plurality ofspacedapart protrusions thereon, said crown and said window havingcorresponding spaced-apart and aligned apertures therein receiving saidprotrusions, the transverse ,width of the apertures in said window beingat least as small as the transverse width of said protrusions tocooperate with said protrusions in press fit relation, and means forsecuring the other end of said strap to said crown to provide aninterlocked crown and window assembly, said last-named means including arotatable means attached to said crown projecting through an opening insaid strap adjustably releasably tensioning said strap in assembledrelation.

10. Attachment structure for securing a curved window to a curved crowncomprising a strap, means permanently securing said strap at one endthereof to said crown, said strap including a plurality of spaced-apartprotrusions thereon, said crown and said window having correspondingspaced-apart and aligned apertures therein receiving said protrusions,the transverse width of the apertures in said window being at least assmall as the transverse width of said protrusions to cooperate with saidprotrusions in press fit relation, and adjustable means for releasablysecuring the other end of said strap to said crown in adjustable tensionto provide an interlocked crown and window assembly.

11. A protective faceshield comprising: a crown, a faceshield windowsecured to said crown, head gear secured to said crown including firstand second head band sections formed of stiff resilient material havingan unstressed longitudinally straight shape, and engagement meanscoupling said first and second sections to permit relative movementthereof in one direction to shorten their total length and selectivelyprevent relative movement thereof in the opposite direction foradjusting to head size while in position on the wearer, said first headband section comprising a plurality of apertures therein spaced apartlongitudinally of the band and said second head band section havingprojecting cam means thereon including a sloped cam surface disposedtoward said first head band section to spring into and over saidapertures upon relative movement in said one direction and to seat insaid apertures to prevent relative movement in said opposite direction,said second head band section further including means adjacent said cammeans and longitudinally spaced therefrom for closely slidably embracingsaid first head band section to force said cam means against said firsthead band section, the bending of the head band sections around thewearers head urging said cam means into said apertures, at least one ofsaid sections being manually deflectable along its length when said headband is off the wearers head to permit separation of said cam means froman engaged aperture to permit adjustment in said opposite direction.

1. A protective faceshield comprising: a crown, a faceshield windowsecured to said crown, head gear secured to said crown including firstand second head band sections, engagement means coupling said first andsecond sections to permit relative movement thereof in one direction andselectively prevent relative movement thereof in the opposite directionfor adjustment to head size, and means for pivotally securing said headgear to said crown including means forming an aperture in said crown,rotatable means carried by said head gear including a shaped portionextending through said aperture including a threaded bore,finger-operated screw means for threadably engaging said threaded bore,pressure transmitting means including a non-round shaped bore forreceiving said shaped portion disposed between said crown and said screwmeans for mutual rotation with said rotatable means to permit rotationof said head gear without loosening said screw means, and a firstadjustment member disposed between said crown and said rotatable meansincluding at least one projection thereon, said rotatable meansincluding means for receiving said projection to fix said rotatablemeans and said first adjustment member for mutual rotation, and a secondadjustment member mounted for rotation with said first adjustmentmember, means for adjusting the position of said members relative toeach other, and cam means secured to said crown and disposed to abutsaid member upon rotation of said head gear in one direction, said cammeans including a cam surface permitting a spring override of said cammeans by said member upon rotation of said head gear in the oppositedirection.
 2. A protective faceshield comprising: a crown, a faceshieldwindow secured to said crown, head gear secured to said crown includingfirst and second head band sections, and engagement means coupling saidfirst and second sections to permit relative movement thereof in onedirection and selectively prevent relative movement thereof in theopposite direction for adjusting to head size and means for securingsaid faceshield to said crown comprising a strap, non-yielding meansfixedly pivotally securing said strap at one end thereof to said crownand including a plurality of spaced-apart protrusions thereon, saidcrown and said window having corresponding spaced-apart and alignedapertures therein for receiving said protrusion, and adjustablerotatable cam means for releasably securing the other end of said strapto said crown to provide an interlocked crown and window assembly, saidsecuring cam means including means for positively tensioning said strapin assembled relation.
 3. In a protective faceshield, a crown, a windowsecured to said crown, head gear, means adjusting said head gear to thehead size of the wearer, and coupling means for pivotally securing saidhead gear to said crown, said coupling means comprising means forming anaperture in said crown, rotatable means carried by said head gear andincluding a shaped portion extending through said aperture having athreaded bore therein, and being axially longer than the aperture toproject a distance from the crown, screw means for threadedly engagingsaid threaded bore, said screw means including a head, and a pressuretransmitting member including a shaped bore conforming to the shape ofand receiving said shaped portion of said rotatable means for mutualrotation therewith, said pressure transmitting member disposed betweensaid head of said screw means and said crown and being axially thickerthan said distance in order to be directly engaged by said head and tospace said head and said crown to prevent loosening of said screw meansupon rotational movement of said head gear relative said crown.
 4. In aprotective faceshield, a crown, a window secured to said crown, headgear, means adjusting said head gear to the head size of the wearer, andcoupling means for pivotaLly securing said head gear to said crown, saidcoupling means comprising means forming an aperture in said crown,rotatable means carried by said head gear and including a shaped portionextending through said aperture having a threaded bore therein, screwmeans for threadedly engaging said threaded bore, said screw meansincluding a head, and pressure transmitting means including a shapedbore conforming to the shape of and receiving said shaped portion ofsaid rotatable means for mutual rotation therewith, said pressuretransmitting means disposed between said head of said screw means andsaid crown to space said head and said crown to prevent loosening ofsaid screw means upon rotational movement of said head gear relativesaid crown, including an arm secured for rotation with said head gear,and means on said crown cooperable with said arm to prevent rotation ofsaid arm relative to said crown in one direction and permit rotation ofsaid arm in the opposite direction.
 5. In a protective faceshield, acrown, a window secured to said crown, head gear, means adjusting saidhead gear to the head size of the wearer, and coupling means forpivotally securing said head gear to said crown, said coupling meanscomprising means forming an aperture in said crown, rotatable meanscarried by said head gear and including a a shaped portion extendingthrough said aperture having a threaded bore therein, screw means forthreadedly engaging said threaded bore, said screw means including ahead, and pressure transmitting means including a shaped bore conformingto the shape of and receiving said shaped portion of said rotatablemeans for mutual rotation therewith, said pressure transmitting meansdisposed between said head of said screw means and said crown to spacesaid head and said crown to prevent loosening of said screw means uponrotation movement of said head gear relative said crown, including anarm secured for rotation with said head gear, and means cooperable withsaid arm to prevent rotation in one direction and permit rotation in theopposite direction, wherein the last-mentioned means includes a pinsecured to said crown in an interference relationship with rotationaltravel of said arm, said pin having a camming surface oriented to permitoverride thereof by said arm upon rotation of said opposite direction.6. In a protective faceshield having a crown, a window secured to saidcrown and head gear secured to said crown, the improvement comprisingmeans for releasably securing said window to said crown including firstmeans forming a plurality of spaced-apart apertures in said window,second means forming a plurality of spaced-apart apertures in said crownfor alignment with the apertures of said window, a strap, non-yieldingmeans fixedly pivotally securing said strap at one end thereof to saidcrown, said strap including a plurality of protrusions thereon to bereceived by the aligned apertures of said crown and window, andadjustable means for releasably securing the other end of said strap tosaid crown with said strap adjustably tensioned.
 7. In a protectivefaceshield having a crown, a window secured to said crown and head gearsecured to said crown, the improvement comprising means for releasablysecuring said window to said crown including first means forming aplurality of spaced-apart apertures in said window, second means forminga plurality of spaced-apart apertures in said crown for alignment withthe apertures of said window, a strap, means permanently pivotallysecuring one end thereof to said crown, said strap including a pluralityof protrusions thereon to be received by the aligned apertures of saidcrown and window, and means for securing the other end of said strap tosaid crown with said strap in tension, wherein the last-mentioned meanscomprises lever means secured to said crown, means forming an elongateslot in said other end of said strap for receiving said lever means, andmeans formed on said crown cooperable with said lever means to tenSionsaid strap, said lever means being adjustable and releasably securingthe strap in adjustable tension.
 8. A crown-to-headgear attachmentcomprising means for pivotally securing said head gear to said crownincluding means forming a circular aperture in said crown, rotatablemeans carried by said head gear including a shaped portion extendingthrough said aperture including a threaded bore, and being axiallylonger than said aperture, finger-operated screw means for threadablyengaging said threaded bore and having a head, and pressure transmittingmeans including a non-round shaped bore for receiving said shapedportion disposed between said crown and said screw means for mutualrotation with said rotatable means to permit rotation of said head gearwithout loosening said screw means, said pressure transmitting meansbeing axially longer than the part of said shaped portion projectingbeyond the aperture for direct engagement between said head and saidpressure transmitting means.
 9. Attachment structure for securing acurved window to a curved crown comprising a strap, non-yielding meansfixedly securing said strap at one end thereof to said crown, said strapincluding a plurality of spaced-apart protrusions thereon, said crownand said window having corresponding spaced-apart and aligned aperturestherein receiving said protrusions, the transverse width of theapertures in said window being at least as small as the transverse widthof said protrusions to cooperate with said protrusions in press fitrelation, and means for securing the other end of said strap to saidcrown to provide an interlocked crown and window assembly, saidlast-named means including a rotatable means attached to said crownprojecting through an opening in said strap adjustably releasablytensioning said strap in assembled relation.
 10. Attachment structurefor securing a curved window to a curved crown comprising a strap, meanspermanently securing said strap at one end thereof to said crown, saidstrap including a plurality of spaced-apart protrusions thereon, saidcrown and said window having corresponding spaced-apart and alignedapertures therein receiving said protrusions, the transverse width ofthe apertures in said window being at least as small as the transversewidth of said protrusions to cooperate with said protrusions in pressfit relation, and adjustable means for releasably securing the other endof said strap to said crown in adjustable tension to provide aninterlocked crown and window assembly.
 11. A protective faceshieldcomprising: a crown, a faceshield window secured to said crown, headgear secured to said crown including first and second head band sectionsformed of stiff resilient material having an unstressed longitudinallystraight shape, and engagement means coupling said first and secondsections to permit relative movement thereof in one direction to shortentheir total length and selectively prevent relative movement thereof inthe opposite direction for adjusting to head size while in position onthe wearer, said first head band section comprising a plurality ofapertures therein spaced apart longitudinally of the band and saidsecond head band section having projecting cam means thereon including asloped cam surface disposed toward said first head band section tospring into and over said apertures upon relative movement in said onedirection and to seat in said apertures to prevent relative movement insaid opposite direction, said second head band section further includingmeans adjacent said cam means and longitudinally spaced therefrom forclosely slidably embracing said first head band section to force saidcam means against said first head band section, the bending of the headband sections around the wearer''s head urging said cam means into saidapertures, at least one of said sections being manually deflectablealong its length when said head band is off the wearer''s head to permitseparation of said cam means from an engaged aperture to permitaDjustment in said opposite direction.